OK, I replicated the issue with MIPI #1 and 64bit OS.
1) after flashing a fresh 64bit system via "Raspberry Pi Imager" with default MIPI #1 configuration it works without any problems.
2) after updating the system with the latest updates using the system icon: "Install updates" MIPI #1 stops working.
3) only after fully updating the system with the command "sudo rpi-update" MIPI #1 started working again.
EDIT: step 3) updated also eeprom firmware from "Jan 8" to "Jan 14" revision.
1) after flashing a fresh 64bit system via "Raspberry Pi Imager" with default MIPI #1 configuration it works without any problems.
2) after updating the system with the latest updates using the system icon: "Install updates" MIPI #1 stops working.
3) only after fully updating the system with the command "sudo rpi-update" MIPI #1 started working again.
EDIT: step 3) updated also eeprom firmware from "Jan 8" to "Jan 14" revision.
Statistics: Posted by adsp531 — Thu Jan 16, 2025 8:15 pm